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java.lang.NullPointerException at org.apache.hadoop.fs.swift.snative.SwiftNativeOutputStream.flush(SwiftNativeOutputStream.java:102)[hadoop-openstack-2.3.0.jar:?] at java.io.FilterOutputStream.flush(FilterOutputStream.java:140)[?:1.8.0_73] at java.io.DataOutputStream.flush(DataOutputStream.java:123)[?:1.8.0_73] at io.druid.indexer.JobHelper$4.push(JobHelper.java:375)[druid-indexing-hadoop-0.9.1.1.jar:0.9.1.1] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[?:1.8.0_73] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[?:1.8.0_73] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[?:1.8.0_73] at java.lang.reflect.Method.invoke(Method.java:497)[?:1.8.0_73] at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:186)[hadoop-common-2.3.0.jar:?] at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)[hadoop-common-2.3.0.jar:?] at com.sun.proxy.$Proxy229.push(Unknown Source)[?:?] at io.druid.indexer.JobHelper.serializeOutIndex(JobHelper.java:386)[druid-indexing-hadoop-0.9.1.1.jar:0.9.1.1] at io.druid.indexer.IndexGeneratorJob$IndexGeneratorReducer.reduce(IndexGeneratorJob.java:703)[druid-indexing-hadoop-0.9.1.1.jar:0.9.1.1] at io.druid.indexer.IndexGeneratorJob$IndexGeneratorReducer.reduce(IndexGeneratorJob.java:469)[druid-indexing-hadoop-0.9.1.1.jar:0.9.1.1] at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:171)[hadoop-mapreduce-client-core-2.3.0.jar:?] at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:627)[hadoop-mapreduce-client-core-2.3.0.jar:?] at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:389)[hadoop-mapreduce-client-core-2.3.0.jar:?] at org.apache.hadoop.mapred.LocalJobRunner$Job$ReduceTaskRunnable.run(LocalJobRunner.java:319)[hadoop-mapreduce-client-common-2.3.0.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[?:1.8.0_73] at java.util.concurrent.FutureTask.run(FutureTask.java:266)[?:1.8.0_73] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[?:1.8.0_73] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[?:1.8.0_73] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_73]